Boost-based power factor correction with closed-loop control

A system, comprising:

• a plurality of light-emitting diodes (LEDs);
• and
• a current-source fed power factor correction circuit, comprising:
• a current transformer configured to step down a current from a current source;
• a diode bridge rectifier connected to the current transformer;
• a capacitor connected to an output of the diode bridge rectifier;
• a boost converter having a start-up diode and connected to the capacitor;
• a direct current (DC)-DC converter connected to an output of the boost converter and configured to regulate an operation of the plurality of LEDs;
• a voltage sensor configured to determine output voltage;
• and
• a current sensor configured to determine a current associated with the diode bridge rectifier, wherein the current transformer, the capacitor, and a boost inductor of the boost converter act as a latching current limiter (LCL) filter.

A method, comprising:

• connecting a circuit to a current source, the circuit comprising:
• a current transformer configured to step down a current from the current source;
• a diode bridge rectifier connected to the current transformer;
• a capacitor connected to an output of the diode bridge rectifier;
• a boost converter having a start-up diode and connected to the capacitor;
• a direct current (DC)-DC converter connected to an output of the boost converter and configured to regulate an operation of a string of light-emitting diodes (LEDs);
• a voltage sensor configured to determine output voltage;
• and
• a current sensor configured to determine a current associated with the diode bridge rectifier, wherein the current transformer, the capacitor, and a boost inductor of the boost converter act as a latching current limiter (LCL) filter;
• charging the capacitor via the start-up diode;
• activating the string of LEDs responsive to a boost output voltage exceeding a string voltage associated with the string of LEDs.